It is also worth mentioning that the KAF2 (audio filter and real-time clock) is a good addition for CW reception.
IMHO it does help a lot when copying weak signals and also having the real-time clock is useful. http://www.elecraft.com/kaf2.htm Michael VE3WMB (K2 #5995) >From: Don Wilhelm <donw...@embarqmail.com <mailto:donw...@embarqmail.com>> >Subject: Re: [Elecraft] K2 Filter question >Date: January 8, 2017 at 11:45:09 AM GMT-5 >To: Mike Smith VE9AA <ve...@nbnet.nb.ca <mailto:ve...@nbnet.nb.ca>>, >Elecraft@mailman.qth.net <mailto:Elecraft@mailman.qth.net> >Reply-To: donw...@embarqmail.com <mailto:donw...@embarqmail.com> >Mike, >The K2 has a built-in 5 pole filter on the RF board that you can set to >variable widths using the CAL FIL menu - you must have the internal counter >probe to change the filter settings. >There are 4 filter settings for each mode. >These are not "roofing filters" as used in the K3, but IF crystal filters. >The filter type in the base K2 is of a Cohn design and the width can be >changed as I stated above. Its design width is about 500Hz >and gives a nice >passband from about 1.5kHz down to about 200Hz. >It can be widened out to SSB listening levels, but the passband becomes quite >ragged at those wider widths. It is however suitable for SSB listening. The >filter on the KSB2 option board has a nice flat >passband. >The KSB2 option (for SSB) has a fixed width 7 pole filter. The early filters >were 2.1kHz width, but more recent filters are 2.4kHz. >Elecraft has a capacitor kit which will allow you to change the filter width. >The crystals used in the K2 filter were upgraded to better speced crystals at >SN 2560. I would recommend that K2s below that SN be upgraded with the new >crystals. Elecraft sells a kit of matched >crystals at a very reasonable >price a set of 7 for the base K2 or a set of 14 for both the base K2 and the >KSB2 option. >73, >Don W3FPR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
